参数资料
型号: LTC3733CG
厂商: Linear Technology
文件页数: 1/32页
文件大小: 0K
描述: IC CTRLR BUCK AMD 3PHASE 36-SSOP
标准包装: 37
应用: 控制器,AMD
输入电压: 4 V ~ 36 V
输出数: 1
输出电压: 0.8 V ~ 1.55 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 管件
产品目录页面: 1339 (CN2011-ZH PDF)
LTC3733/LTC3733-1
3-Phase, Buck
Controllers for AMD CPUs
FEATURES
DESCRIPTIO
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3-Phase Controller with Onboard MOSFET Drivers
Current Mode Control Ensures Current Sharing
Differential Amplifier Accurately Senses V OUT
± 5% Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
Reduced Input and Output Capacitance
Supports Active Voltage Positioning
VID Programmable Output Voltage from 0.8V to 1.55V
(AMD Opteron TM CPU)
6-Phase, 90A to 120A Operation
Output Power Good Indicator with Adaptive Blanking
210kHz to 530kHz Per Phase, PLL, Fixed Frequency
Synchronizable (LTC3733-1)
The LTC ? 3733 family are PolyPhase ? synchronous step-
down switching regulator controllers that drive all
N-channel external power MOSFET stages in a phase-
lockable, fixed frequency architecture. The 3-phase con-
troller drives its output stages with 120 ° phase separation
at frequencies of up to 530kHz per phase to minimize the
RMS current dissipated by the ESR of both the input and
output filter capacitors. The 3-phase technique effectively
triples the fundamental frequency, improving transient
response while operating each phase at an optimal fre-
quency for efficiency and ease of thermal design. Light
load efficiency is optimized by using a choice of output
stage shedding or Burst Mode technology.
PWM, Stage Shedding or Burst Mode ? Operation
OPTI-LOOP ? Compensation Minimizes C OUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
No_CPU Detection
36-Lead 0.209" SSOP and 38-Lead (5mm × 7mm) QFN
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APPLICATIO S
A differential amplifier provides true remote sensing of both
the high and low sides of the output voltage at load points.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. A foldback current
circuit also provides protection for the external MOSFETs
under short-circuit or overload conditions. An all-“1” VID
detector turns off the regulator after 1 μ s timeout.
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High Performance Notebook Computers
Servers, Desktop Computers and Workstations
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology
Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
V IN
5V
10 μ F
V CC
LTC3733-1
BOOST1
BOOST2
TG1
SW1
BG1
L1 0.8 μ H
D1
0.002 ?
+
22 μ F
35V
× 2
5V TO 28V
0.1 μ F
BOOST3
SENSE1 +
SENSE1 –
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYN IN
PGOOD
PLLIN
TG2
SW2
V IN
L2 0.8 μ H
0.002 ?
V OUT
0.8V TO 1.55V
5 VID BITS
PLLFLTR
VID0-VID4
BG2
PGND
D2
65A
ON/OFF
680pF
RUN
SENSE2 +
SENSE2 –
5k
0.1 μ F
I TH
SS
SGND
TG3
SW3
BG3
V IN
L3 0.8 μ H
D3
0.002 ?
EAIN
SENSE3
100pF
IN –
IN +
SENSE3 +
+
C OUT
470 μ F
4V
× 4
3733 F01
Figure 1. High Current Triple Phase Step-Down Converter
3733f
1
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